User's Manual

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Chapter 3 System Structure

LTE eNB System Description v2.0 28

and filter. It sends and receives traffic, clock information, and alarm/control

messages to and from LCC4. It has 4Tx/4Rx, 2Tx/4Rx or 2Tx/2Rx configurations

with optic CPRI support.

Each RRH is connected an optic CPRI; up to 12 RRHs can be connected to LCC4.

The CDU is the multi-board type DU in which LMD1 that carries out the main

processor function, network interface function, and clock creation and distribution

function. The LCC4 carries out the modem function are mounted. It consists of the

power module (PDPM), FANM-C4A, and air filter. The CDU is mounted on a 19

inch rack, with fan cooling and EMI available in each unit, and supports a RRH

and optic CPRI interface.

The following figure shows CDU configuration:

Figure 13. CDU Configuration (CDU)

UADB

blank

LCC4-B1A

Power

FANM-C4A

LMD1-J1A

Air filter

The following table shows the key features and configurations of each board:

Table 7. Key Features and Configuration

Board

Quantity

Description

UADB

Universal platform type A Digital Backplane board assembly

 CDU backboard

 Routing signals for traffic, control, clocks, power, and so on.

LMD1-J1A

Main processing card for clock generation/distribution, network interfacing,

IP processing, system OAM function and UDE/UDA function.

LCC4-B1A

Max. 3

Channel processing card for call processing, resource assignment,

OFDMA/SC-FDMA channel processing, and CPRI interface with RU.

FANM-C4A

Fan Module-C4A

CDU cooling fan module

LMD1

The LMD1 provides main processor function, interface with network, interfaces

with external devices, and clock generation and distribution.

 Main Processor Feature